Studying TeV halos with high-energy gamma rays from HAWC.

TeV halos are extended gamma‑ray emissions from high‑energy electrons and positrons escaping pulsars and radiating via inverse Compton scattering. I present a study of a region around PSR J1928+1746, a middle‑aged pulsar, by using data from High-Altitude Water Cherenkov (HAWC) Observatory. We have tested a symmetric Gaussian against a diffusion template and including a Galactic diffuse component. We find extended emission near the pulsar with a hard spectrum consistent with slow particle diffusion. Given the source's distance and the present resolution/sensitivity, a simple Gaussian yields a slightly better statistical fit than the diffusion template. We therefore classify the source as HAWC J1928+1748, a TeV‑halo candidate. Cross‑checks with the last results of HAWC and the Large High Altitude Air Shower Observatory (LHAASO) show consistent position, extent, and flux. Looking ahead, SWGO (Southern Wide-field Gamma-ray Observatory) will extend halo searches to the southern sky and improve separation and energy‑resolved morphology.